On Wednesday, December 26, 2018 at 12:38:21 AM UTC-8, wrote:
Bob Harris’s altitude record flight is described in an article by Pat Valdata in the October '88 issue of Soaring Magazine. The article is available to SSA members in the on-line magazine archive. However, that article does not go into detail about the oxygen system issue.
I don’t know what else is available on-line, but I have a pdf of his Benalla presentation which includes both a discussion of the flight and his oxygen regulators’ performance. I would be happy to forward it to anyone who wants it. Email me (first initial last name at cox.net).
Mike Koerner

The article referenced is not in the October 88 issue, rather the February 88 issue.